tests/pools/thread/fixed.test.js

   1 const { expect } = require('expect')
   2 const { FixedThreadPool, PoolEvents } = require('../../../lib')
   3 const { WorkerFunctions } = require('../../test-types')
   4 const TestUtils = require('../../test-utils')
   5
   6 describe('Fixed thread pool test suite', () => {
   7   const numberOfThreads = 6
   8   const pool = new FixedThreadPool(
   9     numberOfThreads,
  10     './tests/worker-files/thread/testWorker.js',
  11     {
  12       errorHandler: e => console.error(e)
  13     }
  14   )
  15   const queuePool = new FixedThreadPool(
  16     numberOfThreads,
  17     './tests/worker-files/thread/testWorker.js',
  18     {
  19       enableTasksQueue: true,
  20       tasksQueueOptions: {
  21         concurrency: 2
  22       },
  23       errorHandler: e => console.error(e)
  24     }
  25   )
  26   const emptyPool = new FixedThreadPool(
  27     numberOfThreads,
  28     './tests/worker-files/thread/emptyWorker.js',
  29     { exitHandler: () => console.log('empty pool worker exited') }
  30   )
  31   const echoPool = new FixedThreadPool(
  32     numberOfThreads,
  33     './tests/worker-files/thread/echoWorker.js'
  34   )
  35   const errorPool = new FixedThreadPool(
  36     numberOfThreads,
  37     './tests/worker-files/thread/errorWorker.js',
  38     {
  39       errorHandler: e => console.error(e)
  40     }
  41   )
  42   const asyncErrorPool = new FixedThreadPool(
  43     numberOfThreads,
  44     './tests/worker-files/thread/asyncErrorWorker.js',
  45     {
  46       errorHandler: e => console.error(e)
  47     }
  48   )
  49   const asyncPool = new FixedThreadPool(
  50     numberOfThreads,
  51     './tests/worker-files/thread/asyncWorker.js'
  52   )
  53
  54   after('Destroy all pools', async () => {
  55     // We need to clean up the resources after our test
  56     await echoPool.destroy()
  57     await asyncPool.destroy()
  58     await errorPool.destroy()
  59     await asyncErrorPool.destroy()
  60     await emptyPool.destroy()
  61     await queuePool.destroy()
  62   })
  63
  64   it('Verify that the function is executed in a worker thread', async () => {
  65     let result = await pool.execute({
  66       function: WorkerFunctions.fibonacci
  67     })
  68     expect(result).toBe(121393)
  69     result = await pool.execute({
  70       function: WorkerFunctions.factorial
  71     })
  72     expect(result).toBe(9.33262154439441e157)
  73   })
  74
  75   it('Verify that is possible to invoke the execute() method without input', async () => {
  76     const result = await pool.execute()
  77     expect(result).toBe(false)
  78   })
  79
  80   it("Verify that 'busy' event is emitted", async () => {
  81     let poolBusy = 0
  82     pool.emitter.on(PoolEvents.busy, () => ++poolBusy)
  83     for (let i = 0; i < numberOfThreads * 2; i++) {
  84       pool.execute()
  85     }
  86     // The `busy` event is triggered when the number of submitted tasks at once reach the number of fixed pool workers.
  87     // So in total numberOfThreads + 1 times for a loop submitting up to numberOfThreads * 2 tasks to the fixed pool.
  88     expect(poolBusy).toBe(numberOfThreads + 1)
  89   })
  90
  91   it('Verify that tasks queuing is working', async () => {
  92     const maxMultiplier = 2
  93     const promises = new Set()
  94     for (let i = 0; i < numberOfThreads * maxMultiplier; i++) {
  95       promises.add(queuePool.execute())
  96     }
  97     expect(promises.size).toBe(numberOfThreads * maxMultiplier)
  98     for (const workerNode of queuePool.workerNodes) {
  99       expect(workerNode.tasksUsage.running).toBeLessThanOrEqual(
 100         queuePool.opts.tasksQueueOptions.concurrency
 101       )
 102       expect(workerNode.tasksUsage.run).toBe(0)
 103       expect(workerNode.tasksQueue.size).toBeGreaterThan(0)
 104     }
 105     expect(queuePool.numberOfRunningTasks).toBe(numberOfThreads)
 106     expect(queuePool.numberOfQueuedTasks).toBe(
 107       numberOfThreads * maxMultiplier - numberOfThreads
 108     )
 109     await Promise.all(promises)
 110     for (const workerNode of queuePool.workerNodes) {
 111       expect(workerNode.tasksUsage.running).toBe(0)
 112       expect(workerNode.tasksUsage.run).toBeGreaterThan(0)
 113       expect(workerNode.tasksQueue.size).toBe(0)
 114     }
 115     promises.clear()
 116   })
 117
 118   it('Verify that is possible to have a worker that return undefined', async () => {
 119     const result = await emptyPool.execute()
 120     expect(result).toBeUndefined()
 121   })
 122
 123   it('Verify that data are sent to the worker correctly', async () => {
 124     const data = { f: 10 }
 125     const result = await echoPool.execute(data)
 126     expect(result).toStrictEqual(data)
 127   })
 128
 129   it('Verify that error handling is working properly:sync', async () => {
 130     const data = { f: 10 }
 131     let inError
 132     try {
 133       await errorPool.execute(data)
 134     } catch (e) {
 135       inError = e
 136     }
 137     expect(inError).toBeDefined()
 138     expect(inError).toBeInstanceOf(Error)
 139     expect(inError.message).toBeDefined()
 140     expect(typeof inError.message === 'string').toBe(true)
 141     expect(inError.message).toBe('Error Message from ThreadWorker')
 142     expect(
 143       errorPool.workerNodes.some(
 144         workerNode => workerNode.tasksUsage.error === 1
 145       )
 146     ).toBe(true)
 147   })
 148
 149   it('Verify that error handling is working properly:async', async () => {
 150     const data = { f: 10 }
 151     let inError
 152     try {
 153       await asyncErrorPool.execute(data)
 154     } catch (e) {
 155       inError = e
 156     }
 157     expect(inError).toBeDefined()
 158     expect(inError).toBeInstanceOf(Error)
 159     expect(inError.message).toBeDefined()
 160     expect(typeof inError.message === 'string').toBe(true)
 161     expect(inError.message).toBe('Error Message from ThreadWorker:async')
 162     expect(
 163       asyncErrorPool.workerNodes.some(
 164         workerNode => workerNode.tasksUsage.error === 1
 165       )
 166     ).toBe(true)
 167   })
 168
 169   it('Verify that async function is working properly', async () => {
 170     const data = { f: 10 }
 171     const startTime = performance.now()
 172     const result = await asyncPool.execute(data)
 173     const usedTime = performance.now() - startTime
 174     expect(result).toStrictEqual(data)
 175     expect(usedTime).toBeGreaterThanOrEqual(2000)
 176   })
 177
 178   it('Shutdown test', async () => {
 179     const exitPromise = TestUtils.waitExits(pool, numberOfThreads)
 180     await pool.destroy()
 181     const numberOfExitEvents = await exitPromise
 182     expect(numberOfExitEvents).toBe(numberOfThreads)
 183   })
 184
 185   it('Should work even without opts in input', async () => {
 186     const pool1 = new FixedThreadPool(
 187       numberOfThreads,
 188       './tests/worker-files/thread/testWorker.js'
 189     )
 190     const res = await pool1.execute()
 191     expect(res).toBe(false)
 192     // We need to clean up the resources after our test
 193     await pool1.destroy()
 194   })
 195
 196   it('Verify that a pool with zero worker fails', async () => {
 197     expect(
 198       () => new FixedThreadPool(0, './tests/worker-files/thread/testWorker.js')
 199     ).toThrowError('Cannot instantiate a fixed pool with no worker')
 200   })
 201 })